Photo 1a. Pillow lavas in the Canada Falls Member of the Frontenac Formation near Canada Falls and Seboomook Lakes in northwestern Maine. They are slightly more than 400 million years old. In this cross-sectional view the group of pillows have been tipped on edge so that the rounded tops are on the right side and the concave bottoms on the left. (Photo: R. Marvinney)

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Last updated on October 6, 2005

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